午餐會報 (2024)
- 連絡窗口
- 午餐會報: 研討會委員(talksasiaa.sinica.edu.tw)
- 實驗室午餐會報: 張曉文 (hwchangasiaa.sinica.edu.tw)
近期午餐會報: 2024-04-01 Mon 12:00~12:40 [R1412] | |
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Speaker: | Bovornpratch Vijarnwannaluk |
No. | 時間地點 | 講者 | 題目(摘要) |
---|---|---|---|
1 | 2024-05-20 Mon 12:00~12:40 R1412 | Shih-Hao Wang [ASIAA] | Probing the Universe with ultra-high energy cosmic neutrinos beyond 100 PeV |
2 | 2024-05-06 Mon 12:00~12:40 R1412 | Shouvik Roy Choudhury [ASIAA] | Massive neutrino self-interactions and the Hubble tension |
3 | 2024-04-29 Mon 12:00~12:40 R1412 | Dan Luo (羅丹) [AS Counseling Center] | Caring and a general introduction to the AS counseling center (如何關心他人以及介紹關懷中心) |
4 | 2024-04-22 Mon 12:00~12:40 R1412 | Ming-Jye Wang [ASIAA] | Toward a 100-pixel heterodyne sub-mm receiver |
5 | 2024-04-15 Mon 12:00~12:40 R1412 | Fabrizio Arrigoni Battaia [MPA] | |
6 | 2024-04-08 Mon 12:00~12:40 R1412 | Travis Thieme [ASIAA] | |
7 | 2024-04-01 Mon 12:00~12:40 R1412 | Bovornpratch Vijarnwannaluk [ASIAA] | |
8 | 2024-03-18 Mon 12:00~12:40 R1412 | Ryan Keenan [Educational technology industry] | From astronomy to education technology and technology education Abstract Ten years ago I was living in Taipei as a postdoc at ASIAA. Early the following year I left to try my luck in the field of data science, which involved studying, taking on side projects to build a portfolio, and applying for jobs. Ultimately, I took a job in the field of online education. Since then I've worked with three different companies to create courses focused on artificial intelligence and machine learning that serve thousands of learners worldwide. In this talk I will include a brief summary of my work in astronomy followed by stories and learnings from my transition into the world of silicon valley ed-tech companies. |
9 | 2024-03-11 Mon 12:00~12:40 R1412 | Aisling Murphy [ASIAA] | Symmetries and Asymmetries in the Th 28 Protostellar Jet Abstract Protostellar jets often exhibit asymmetric properties between both lobes, ranging from their morphological and kinematic features to gas properties such as density and temperature. To determine whether these differences in the surrounding medium or the intrinsic properties of the jet, we need to characterize and trace these asymmetries close to the source. The Th 28 protostellar jet highlights these features with striking asymmetries between the jet lobes, while also showing a small-scale wiggling with a point symmetry indicating precession. I will present results from an optical/NIR study of this jet which combines integral field spectroscopy from VLT/MUSE and echelle spectroscopy from VLT/X-Shooter to obtain a 3D spatial and spectral view of both jet lobes, allowing us to investigate both the asymmetries and symmetries between them. |
10 | 2024-03-04 Mon 12:00~12:40 R1412 | Sheng-Yuan Liu [ASIAA] | |
11 | 2024-02-19 Mon 12:00~12:40 R1412 | You-Hua Chu [ASIAA] | Academic Writing |
12 | 2024-02-05 Mon 12:00~12:40 R1412 | Bandy Shang [TASA] | Career experience sharing: from astro to space engineering |
13 | 2024-01-29 Mon 12:00~12:40 R1412 | Yu-Hsuan (Eltha) Teng [UCSD] | Re-evaluating Star Formation Efficiencies with a New CO-to-H2 Conversion Factor Prescription Abstract Star formation in galaxies is governed by the amount of molecular gas and the efficiency that gas is converted into stars. However, assessing the amount of molecular gas relies on the CO-to-H2 conversion factor (α_CO), which is known to vary with molecular gas conditions like density, temperature, and dynamical state – the same conditions that also alter star formation efficiency. The variation of α_CO, particularly in galaxy centers where α_CO can drop by nearly an order of magnitude, thus causes major uncertainties in current molecular gas and star formation efficiency measurements. Using ALMA observations of multiple 12CO, 13CO, and C18O lines in several barred galaxy centers, we found that α_CO is primarily driven by CO opacity changes and therefore shows strong correlations with observables like velocity dispersion and 12CO/13CO line ratio. Motivated by these results, we have established a new α_CO prescription which accounts for CO emissivity variations and verified it across a set of nearby galaxies with independent α_CO measurements from dust. Applying our new prescription to 65 galaxies from the PHANGS-ALMA survey, we found an overall 3x higher star formation efficiency in barred than non-barred galaxy centers, which is an unprecedented trend that has been obscured by past α_CO prescriptions. Our results suggest that the high star formation rates observed in barred galaxy centers is mainly due to an enhanced star formation efficiency, rather than a substantially increased amount of molecular gas. |
14 | 2024-01-15 Mon 12:00~12:40 R1412 | Kai-Yang Lin [ASIAA] | BURSTT Development Abstract Fast Radio Bursts (FRBs) have been shown to have diverse properties and may come from very different host environments. To better understand the FRBs' origin, multi-wavelength detailed studies of a large sample of nearby FRB hosts will provide valuable information. To fulfill this goal, BURSTT has been designed with a large field of view and sub-arcsecond localization capabilities. In this talk, I will introduce the BURSTT project and its development status, focusing on the backend system, calibration, and VLBI timing I mainly work on. |